import wsgiref.handlers

from google.appengine.api import users
from google.appengine.ext import webapp

class MainPage(webapp.RequestHandler):
    def get(self):
        user = users.get_current_user()
        
        if user:
            self.response.headers['Content-Type'] = 'text/plain'
            self.response.out.write('Hello, ' + user.nickname())
            
        else:
            self.redirect(users.create_login_url(self.request.uri))

def main():
    application = webapp.WSGIApplication([('/', MainPage)], debug=True)
    wsgiref.handlers.CGIHandler().run(application)

if __name__ == "__main__":
    main()